NL1021612C2 - Method and device for manufacturing a bag package, as well as bag package. - Google Patents

Abstract

The method involves connecting netting material to at least two foil strips (12A,12B) individually provided with printing patterns along its length, in which the foil strips are supplied in a coupled manner from one foil stock roller (11). Independent claims are also included for the following: (a) a bag package manufacturing apparatus; and (b) a stock roller.

Description

Title: Method and device for manufacturing a bag package, as well as bag packaging

The invention relates to a method for manufacturing a bag package from tubular or strip-shaped net material, wherein the net material of the bag to be formed is connected to at least two foil strips, each of which is provided with a longitudinal-directional print.

Such a method for manufacturing a bag package from tubular or strip-shaped material is generally known and is used for manufacturing bag packages for fruit, vegetables, potatoes, onions, nuts, etc.

During packaging a tube is formed with the net material, which tube is each time provided with a transverse weld on the underside, so that a bag is formed. The bag is filled with the products to be packaged and is closed with a second cross seal, after which the bag is ready as packaging and can be separated. The tube can be supplied from a supply, such as a roll. However, the tube can also be assembled during the manufacture of the bag package from one or more strips, at least partially overlapping at their longitudinal edges, including at least one strip of material, overlapping parts of the strips being welded in the longitudinal direction of the strips connected.

The net material ensures that the bag package is sufficiently open for aeration of the packaged products, but still retains sufficient strength to be able to bear the weight of the products.

However, the net material is not of itself well suited for applying an easily readable print. It has therefore already been proposed to connect the net material to at least two foil strips, each of which is provided with a longitudinally-reporting print. The film strips extend, for example, in the longitudinal direction of the bag package between the cross welds over a front and rear side of the bag. With the aid of such a printed foil, for example, a front side of the bag package can be provided with an attractive print with brand name, while the strip can be provided with product information on the rear side.

EP 1 053 939 describes a method of the type mentioned in the preamble I, wherein a tubular film is provided on both sides when the bag is filled, a strip of printed film, while NL 1007029 I proposes, in the name of the applicant, a web of material. provided with a strip of foil, which web of mesh material after forming into a sleeve over the overlap area of the longitudinal edges on the strip is provided with a second strip of foil.

The film strips are each taken from a stock, for example a first roll of film with a reporting printing pattern 15 which defines the front side of the bag package to be filled and a film printed separately therefrom and which forms the rear side of the bag package to be formed .

A problem which occurs with the known method is the alignment of the report of the front strip with the report of the rear strip. Namely, when from the supply of net and strip material, as is customary in the production of net bag packages, several thousand net bag packages are produced in succession, the report of the first strip does not coincide with the report of the second strip. In practice, this problem has been solved in NL 1007029 by selecting the report of the H printing strip for the front equal to the length of the bag packaging between the cross welds and by controlling the feed step-by-step on the basis of a marking co-reporting in the printing pattern . The second foil strip, which forms the rear side, is thereby entrained with the net material from a free-rolling roll. By choosing the length 3 of the printing report of the second foil strip more than twice as small, it can be ensured that the printing pattern is depicted on the back of the bag package at least once in its entirety. Although such a idler roller 5 can provide a fast and inexpensive method, a packaging manufactured in this way appears to be less cared for at least at the rear.

To overcome this disadvantage, it has already been proposed to connect two strips of film material in flat condition in advance with flat strips of net material under controlled conditions, so that a parallel report 10 is obtained, and to roll up this composite strip and then use it as a supply. A disadvantage of this proposal, however, is that the stock rolls can contain relatively little strip length due to the welds present thereon and thus take up much storage space.

It is of course possible to also provide the second printing strip 15 with a co-reporting mark and to ensure that the reports of the strips are aligned with the aid of an extension of the control system. However, this is too expensive in practice and can furthermore lead to a loss of productivity and to malfunctions.

It is an object of the invention to provide a method of the type mentioned in the preamble 20, with which two film strips, each provided with a longitudinal report printing with a parallel report, can be processed into bag packaging in a simple and inexpensive manner. To that end, the method according to the invention is characterized in that the foil strips are supplied coupled from one supply.

25 By obtaining the foil strips linked from one stock, synchronization of the reports can be guaranteed.

The film strips can for instance be supplied coupled from stock, if this stock is designed as at least two separate rolls of film which are received from mechanically coupled shafts or on a central shaft. The two strips 1021612 H are supplied coupled from one supply in an elegant manner in that the film stock comprises a single film strip with at least two juxtaposed, reporting patterns with a parallel report, which strip is divided across the width into sub strips that each bear an H 5 printing pattern . The film stock can be, for example, a zigzag wound strip, but is preferably a strip film wound into a roll, for example a roll of film on which, in the width direction H of the strip, a printing pattern corresponding to the front side and the rear side of the package has been provided in a report corresponding to the length of a bag.

Such a roll is advantageously designed as a follow-on roll, wherein the supply roll is unwound because the film webs move along with the net material after coupling.

In this way, when the packaging of the packaging is easily changed when packaging products, only one stock roll with printed foil needs to be changed. It will be clear that this considerably simplifies the stock management of the materials required for assembling different packages and reduces the risk of errors in choosing the film webs for packages from different customers or products.

The sub-strips are preferably connected in the flat state to a flat strip of mesh material. By applying at least one of the sub-strips overlapping on the net material over only a part of its width, net material can be saved. The total width of the net material strips can then be smaller than the circumference of the tube formed with the net material and the strips.

Advantageously, for example, a tube can be formed with the net material by spacing two parallel webs of net material with spacing I and arranging a first sub-strip of foil material with both longitudinal edges overlapping on the longitudinal edges of the strips of net material facing each other. by means of longitudinal welding, and on another longitudinal edge of one of the webs of mesh material, to arrange an additional sub-strip overlapping only near a longitudinal edge and to adhere with the aid of longitudinal welding. The strip thus assembled can be formed into a tube by moving the free longitudinal edges towards each other and attaching it with the strip of film material as a transfer with small overlap with longitudinal welding.

It is noted that it is of course also possible to provide one wide strip of material with a first printed strip which is applied to the net material over its entire width and a second strip which only over a part of its width on a longitudinal edge of the strip net material is applied.

Furthermore, it is possible to connect one sub-strip to the net material before a sleeve is formed therewith and to connect another sub-strip to the net material after a tube has been formed therewith. It is also possible to connect sub-strips to the net material while it is being formed into a tube. It is also possible to connect all sub-strips to the net material after a tube has been formed with it.

The invention also relates to a device for carrying out the method according to the invention and to a strip of foil material for use in the method and the device according to the invention.

Further advantageous embodiments of the invention are shown in the subclaims.

It is noted that in this context, mesh material is to be understood to mean a coarse-meshed structure of connections, preferably constructed from longitudinal and transverse threads, preferably flat fabric threads, which are connected at the places where they intersect. The net material is preferably made of plastic. The wires 10216 ^ 2 can then be fused onto the crossings. However, a woven net structure, whether or not made of plastic material, is to be understood here as net material, as well as a net structure formed by providing foil with perforations that form the meshes of the net.

In addition, it is noted that within this context, foil material is to be understood to mean a substantially closed sheet-like material. The sheet material can comprise several layers. The film material is preferably at least partially made of plastic material.

H 10 Furthermore, in this context, welding is understood to mean joining by fusion and / or bonding.

It is also noted that, within this context, a parallel report H is to be understood to mean a situation in which the reporting patterns have a fixed phase difference with respect to each other; both reporting patterns that have a fixed phase difference with respect to each other, as well as reporting patterns that have a fixed shift relative to each other and patterns that have no shift, therefore fall under this.

The invention will be further elucidated on the basis of an exemplary embodiment which is represented in a drawing. In the drawing I: Fig. 1 shows a schematic perspective view of a device I for carrying out the method according to the invention; Fig. 2 is a schematic side view of a device for performing the method according to the invention; Fig. 3 shows a sleeve formed with strips of net material and foil material; Fig. 4 is a schematic perspective view of a package I according to the invention; and Fig. 5 shows a schematic perspective view of a roll of film material for use in the device or method according to the invention.

It is noted that the figures are only schematic representations of a preferred embodiment of the invention which is only given by way of non-limiting exemplary embodiment. In the figures, identical and corresponding parts are indicated with the same reference numerals.

The device shown in figures 1 and 2 comprises a machine frame indicated in its entirety by 1, on which is located a station 2 with a roll 3 with web-shaped net material 4 pivotally suspended on rollers. In figure 1 the web of the net material is for the sake of clarity not shown. Furthermore, due to the contrast in figure 1, the foil material is shown in hatched form, while in the other figures the net material is shown in hatched form. It is noted that, for the sake of clarity, some parts of the machine frame are only shown in one of the two figures.

The web of net material 4 is supplied in a substantially flat condition via a number of intermediate rollers and is finally fed over rollers 5 and 6 to a so-called forming shoulder 7. At the location of the forming shoulder 7 a sleeve 8 is made with the net material 4 and the film material still to be discussed below. formed with overlapping longitudinal edges 9a, 30, as seen in Figure 3.

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A frame 10 is furthermore provided on the frame 1, on which a single strip of foil 12 wound into a roll 11 is arranged as a film supply. The single strip 12 is provided with two printing patterns R, F having the same report length Ra, which are arranged next to each other in the width direction b of the strip, and which report in the longitudinal direction 1 of the strip. The reports of the printing patterns are the same as shown in Figure 5. In the figure, the rear sides corresponding to the printing patterns 1021612 H are represented by R ', F'. The single strip I foil 12 is supplied via a number of intermediate rollers in a substantially flat state to a cutting device S with which the single strip 12 is subdivided into sub-strips 12a, 12b which each bear a reporting printing pattern. Via a number of intermediate rollers, the sub-strips 12a, 12b are each combined in substantially flat condition on the net material 4 near the roller 13. The film strips 12a, 12b are supplied in the coupled state, namely as one strip, from one supply, namely the roll 11.

In the embodiment I shown here, the supply roll 11 is unwound in that the film webs 12a, 12b move along with the net material 4, after they have been attached to the net material 4, as H will be explained below. The one sub-strip 12a is overlapped over its entire width on the flat strip of material, preferably near the center of the strip of material. The other sub-strip 12b is superimposed over only a part of its width near the longitudinal edge 9b of the flat strip of mesh material. Via rolls 5 and 6, the sub-strips of film material 12a, 12b together with the strip of net material are supplied to the forming shoulder 7. Over this forming shoulder, a sleeve 8 is formed with the strips of film material 12a, 12b and the strip of net material 4, wherein the sub-strip 12b forms an overlap that overlaps the longitudinal edge 9a I of the mesh material. After passing roller 13, the sub-strips 12a, 12b foil material and the net material 4 are guided past a welding station I14 where the strips are bonded to each other by means of local welding. The sub-strip 12a is thereby connected to the net material 4 near its longitudinal edges by means of two longitudinal welds, while the sub-strip 12b is connected to the net material by means of one longitudinal weld 31. As a result, the sub-strips of foil material 12a, 12b cannot shift relative to the mesh material at the location of the forming shoulder. By forming a loop with the aid of additional intermediate rolls 32 I -4 Π Ί i Λ 4 Ί 9, the difference in path length that one sub-strip travels relative to the other sub-strip up to the net material can be adjusted to a natural multiple of the report length Ra, so that the sub-strips with printing patterns are applied to the net material in the same report. The cartridges can of course also be included in the stock with a predetermined shift, so that additional intermediate rolls can be avoided.

By means of a second welding station 23, the overlapping part of the strip of net material 9a and the second sub-strip 12b are welded together by means of a longitudinal weld 32. To this end, the welding station 23 has a jaw 24 placed outside the sleeve 8, as well as a format pipe 25. Placed under the influence of the heat and pressure supplied by the jaw 24, the longitudinal weld 32 is obtained, with which the sleeve 8 becomes ring is closed.

The net material 8 and the sub-strips 12a, 12b are then formed into a bag with the aid of a transverse weld 17. To this end, a welding station 18 is provided which has two jaws 19, 20 which apply heat and pressure to the package consisting of the front wall 21 formed by the sub-strip 12a, the rear wall 22 formed by the sub-strip 12b and the net material extending therebetween. 4 of the sleeve 8. Fig. 3 shows that the longitudinal edges 9a, 9b of the strip of net material 4 do not overlap. Because the second sub-strip 12b forms an overlap, the width of the strip of net material 4 can be chosen smaller than the circumference of the sleeve to be formed.

Via a filling station 26 a predetermined quantity of products is introduced into the sleeve 8 via the format pipe 25, whereafter the sleeve is moved downwards at the location of welding seam 17 with the jaws 19, 20. A second transverse weld 17 is then applied above the introduced products by means of jaws 19, 20, as a result of which the net package is formed into a closed bag 17 which can then be separated. The 1021612 roll 3 of mesh material 4 and the roll 11 of foil material 12 can be designed as follow-on rollers that are designed without their own drive, with the release of the mesh material and the foil material from the supply being provided by the sleeve intermittently at the location of moving the lower weld seam 17 downward along the length of the package, corresponding to the report length Ra. The feed-through of the material can optionally be controlled step by step on the basis of a marking which is also reported in the printing pattern of one of the sub-strips with the aid of a sensor system 29.

It is noted that the invention is not limited to this preferred embodiment shown here and that many variants are possible.

For instance, instead of a cutting device, a separating device can be provided with which the single strip is separated into sub-strips, for example when the single strip is provided with a perforation or tear line. Furthermore, the foil strips coupled I can be supplied from one stock in that individual rolls I of foil material are supported on a central axis or are supported on mechanically coupled axes. Furthermore, the film strips can be added to the net material after a tube has been formed, for example when the net material is supplied as a tube from a supply. Of course, it is also possible to supply the foil strips coupled from one supply I and to feed a first number of sub-strips before forming the sleeve I and another number of sub-strips to the net material after or during forming. The sleeve can also be moved continuously and the movement of the sleeve can also be provided, for example, with friction belts instead of a movable jaw.

Furthermore, the foil strips can be provided with a layer of adhesive for saving for example welding stations.

I 1 Π? 1A1 O

11

Such variants will be clear to those skilled in the art and are understood to fall within the scope of the invention as set forth in the following claims.

1021612

Claims (10)

2. Method according to claim 1, wherein the photo strips are taken from a film stock which comprises a single strip of film with at least two juxtaposed, reporting printing patterns with a parallel report, wherein the single strip is subdivided into sub-strips that each have a reporting printing pattern to wear. The method of claim 2, wherein the single strip is taken from a supply roll. Method according to claim 3, wherein the supply roll is unwound by the film webs that move with the net material. 5. A method according to any one of the preceding claims, wherein at least one of the sub-strips is connected in flat condition to a flat strip of net material. 6. Method as claimed in any of the foregoing claims, wherein at least one of the sub-strips is connected over a part of the width overlapping with a flat strip of net material. 7. Device for manufacturing bag packages, comprising a first guide for supplying a strip of net material, a second guide for supplying a web of foil material, a forming member for forming a sleeve with the net material and the foil material, first welding means for forming a weld extending transversely of the sleeve, second welding means for welding longitudinally of the sleeve, filling means for introducing a quantity of products into the sleeve, cutting means for separating a shape formed between two transverse welds of the sleeve bag with introduced products, characterized by a separating device for separating the strip of film material across the width into sub-strips. 8. Stock roll, apparently intended or suitable for use in a device and / or method according to any one of the preceding claims, comprising a wound strip of film material with at least two strips arranged side by side in the width direction of the strip, each reporting in the longitudinal direction of the strip, of mutually different printing patterns with a parallel report. 9. Device for manufacturing bag packages, in which net material of bags to be formed is connected to at least two foil strips which are each provided with a printing pattern reporting in the longitudinal direction of the strip, characterized in that the device is arranged around the foil strips to be supplied from one stock. 10. Device as claimed in claim 9, comprising a first guide for supplying at least one strip of net material from a supply of net material, a second guide for supplying at least two foil strips coupled from one supply, each of which is provided with a longitudinal direction of the stripe reporting print pattern and a forming member for forming a sleeve with the net material and the film material. 11. Device as claimed in claim 10, further comprising first welding means for forming a weld extending transversely of the sleeve, second welding means for forming a weld extending longitudinally of the sleeve, filling means for introducing an amount into the sleeve 25 products and means for separating from the sleeve a bag of introduced products formed between two cross welds.